Viscosity, Density, and Heat Energy
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Viscosity, Density, and Heat Energy
Year 7 Science Understanding how particles behave with heat
🎯 Learning Intentions & Success Criteria
LI: Understand how heat affects the energy of particles SC: I can describe how increased particle movement affects temperature and state of matter SC: I can explain particle movement with heat absorption and cooling SC: I can describe density and viscosity SC: I can compare the viscosity of various substances 📝 WRITE DOWN: Copy these into your books!
🔥 Settler Activity: Heat & Movement Challenge
Look at the image and discuss with your partner: What do you notice about how the particles are moving? How might temperature affect this movement? 📝 WRITE DOWN: Your observations in your book 2 minutes discussion time!
🧠 I DO: Density Revision
Density = Mass ÷ Volume More particles in same space = higher density Example: Lead vs. Styrofoam Heat can change density by changing volume 📝 WRITE DOWN: The density formula and one example
🤔 Quick Check: Density Meme Break!
Why did the helium balloon break up with the rock? Because the rock was too dense! 😂 But seriously... which has higher density and why?
🥄 I DO: What is Viscosity?
Viscosity = how thick or sticky a liquid is High viscosity = flows slowly (honey, molasses) Low viscosity = flows quickly (water, alcohol) Temperature affects viscosity! 📝 WRITE DOWN: Definition of viscosity + 2 examples
🌡️ WE DO: Heat Changes Everything!
{"left":"Cold honey flows very slowly\nWarm honey flows much faster\nCold engine oil is thick","right":"Hot engine oil is thin\nParticles move faster when heated\nFaster particles = lower viscosity"}
🧪 YOU DO: Viscosity Investigation
Work in pairs to rank these from highest to lowest viscosity: Water, Honey, Tomato Sauce, Milk, Dish Soap 📝 WRITE DOWN: Your ranking with reasons Extension: Predict how heating would change your ranking Think about particle movement!
💭 Think About This...
"When particles get excited by heat, they party harder and liquids get less sticky!" - Your Friendly Neighbourhood Science Teacher 🤓
🎫 Exit Ticket: Show What You Know!
📝 WRITE DOWN answers to these questions: 1. What happens to particle movement when you heat a liquid? 2. How does this affect the liquid's viscosity? 3. Give one real-world example of viscosity changing with temperature Hand in your exit ticket before you leave!